ArticleRSC advances2026
Highly transparent PAA-functionalized porous silica coatings with underwater superoleophobicity and oil-fouling resistance.
Article in RSC advances, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Authors and funding
9 authors.
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Abstract
Transparent underwater superoleophobic coatings hold great promise for underwater optics and marine devices, but their practical application is hindered by the inherent conflict between optical transparency, mechanical robustness, and oil-repellent durability. Here, we report a high-performance transparent underwater superoleophobic (TUS) coating designed by covalently anchoring high-molecular-weight poly(acrylic acid) chains onto a robust, porous nano-silica scaffold. The highly hygroscopic PAA chains form a stable hydration layer on the nanostructured surface, which is critical for achieving underwater oil repellency. This rational design combines mechanical stability with a stable hydration layer, enabling the coating to exhibit high transparency (92.3% in water at 550 nm), robust underwater superoleophobicity (oil contact angle: 169° ± 2°; sliding angle: 1.5° ± 0.3°), and near-zero oil adhesion (adhesion force ≈ 0.48 µN). Crucially, the TUS coating demonstrates good durability under the tested conditions, maintaining its anti-oil-fouling performance and optical clarity after prolonged exposure to high-salinity environments (20 days in 3.5 wt% NaCl), elevated temperatures (up to 70 °C), hydrodynamic shear (0.5 m s
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